﻿<p>The <em>IfcPointOnSurface</em> is a point defined by two parameter value of its defining surface.</p>

<blockquote class="extDef">
NOTE&nbsp; Definition according to ISO/CD 10303-42:1992<br>
A point on surface is a point which lies on a parametric surface. The point is determined by evaluating the surface at a particular pair of parameter values.</blockquote> 

<blockquote class="note">
NOTE&nbsp; Entity adapted from <strong>point_on_surface</strong> in ISO 10303-42.
</blockquote>

<blockquote class="history">
HISTORY&nbsp; New entity in IFC2x2.
</blockquote>

<p class="spec-head">Informal Propositions:</p> 
<ol>
<li>The parametric values specified for u and v shall not be outside the parametric range of the basis surface.</li>
</ol>